Shock sees plenty of play in Standard, and is pretty much always legal in the format
The mana bases are as lackluster as theyve ever been, and the printing of the remaining Odyssey filterlands isnt that remarkable given how generally low power those lands are anyway
Ray Easygoing Firefly is a powerful late game card Ray has been one of my favorite five-cost questers in the game since it came out in Rise of the Floodborn, and I would actually recommend including four copies of him in your deck if you can (I would switch out the two Don Karnages for two Rays as I dont really know what Dons achieving in this deck that Ray cant also do)
You play it, like Eye of Nowhere, as a blue mana denial card
(You may cast cards with retrace from your graveyard by discarding a land card in addition to paying their other costs.) If a spell you cast with retrace is countered, it's put back into your graveyard
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